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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33b0f2bf14b20ad56e3a8cdf848cdb0568b4e0cf50f6e79c4c09557acd18550' 
  AND token = 'DdGxhRHiUWVmQkATW16AiMC2Cv1U3V+4NcQlSW0/Jmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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