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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cac62c6917991761b50e938a27bc16b8b258b78af1d3e728f8b15a91d836264' 
  AND token = 'hTAMz1gclP/a1l93fExJa47QEbqfdB+nTG37J3EoF4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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