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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0849a36c2432a63bb9cd6ed8ff4f8330e87893275fa0c4230c4f88778c34de48' 
  AND token = 'sv9mLVvkfGpEKlGS4n2PZoP4tS+94K1CnhV/19+tMPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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