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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae0c8f6e6be55f2506edfbe9b18b26bde6fd50db21564d7004b3f05e8638a0f' 
  AND token = 'CsVWMt7cpky/Xx6CWmdbGvBhN2UsL5jkTT+NEz+ByjE=' 
  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"
    }
  }
}