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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984c51fec3f6fb0a1c36266b332a2f1b53b2c5b1d19cce318544be8fec0fea82' 
  AND token = 'ppV+vAT9HFOQuAcT3AKT2CUrUGpRcPSEdMxfv0pu5S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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