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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc2cc2f3375dd8fc512163b41e1bb8698a7acc93b00db5137551be484a2979e' 
  AND token = 'ikkMO1zXZKEI2Uy3d0gmlVgl9npdRmNHKDc6wQ+y7n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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