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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0909d3cfe4d81802a2bed6fa8f8d86a07d4e232c579d3c290b875b91fc279b07' 
  AND token = 'UDIsNo3ggRWmtsM6lHtX1XPB6m7yq36Td7e+cFK261w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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