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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82d4d8dd1ed9cae8e78ed3a243bdc7e4fad2ad2fbc166247487fd6dbfcbdd4e' 
  AND token = '7zhq/K0SCgh+q6SSNbIwUWouKIcpaphHbLJwu+f193s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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