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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b4fe75bf086152c0e3aa09c8450cf2bb12fd16faaadedf54e687cd2f08e3ac' 
  AND token = 'Sp0Zs/2nUdxEHHhFeFp4twsFFfr7s0wFc+u2sUCEVPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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