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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a938888c047a83b98a6db07b001705fd8a9c3e43a953e31400d94c62e49d11' 
  AND token = 'efpuGRj8xfjh7yY9GB1iaQZ8smEZ9irIKIhw+53goaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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