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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b696ee9dfa7439bfdc489534ce294f9392f6e9dbfaa3056d23c258ad2164bb20' 
  AND token = '0ABBCIutX2DZJjU9MZesOpk+SWSQ/uc4OqX/icw7cyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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