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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff56bbae5cf62ae3af2d0883bb983c09424e6c208a5e4e0c6ffaab4542de61e' 
  AND token = 'WN+lFQEhxE5rO2H2OEB9cjvx2jXBzxZN63xjn32xZ1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00198

JSON explain

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