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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2856384ef107ba9a0bf9bf1793354317d6a69f81b0eadab718316c4d219cc8' 
  AND token = '2U2BWWku9Q8HyYzB8qGTwOcXyhc4xP5/NaAJ0QysRIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}