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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dfe46272f12ce37c17c7d8d98cc779299f2b7c71925a8ee88f7a0e128c7e08a' 
  AND token = 'Nbsb9twT83zCTLm7mhVorE1Uz7x5vwrHQ7TCU3dV92s=' 
  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"
    }
  }
}