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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b4f7d8b5503c73e8423cacac38145ab1689b0e90782f4fad4219f30e1f13a0' 
  AND token = 'g06bF/ASXT9raERAsg7HAiZvCKmFQzlGrqmSFuif5Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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