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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36f1cd02a218e812325c9cfce5b9894a9fc1fc3c8e7191de5c94b8156f2dc88' 
  AND token = 'LTvaEQ8f3aB0fRXWX2P1qL2s1HQBLBSxQFvVPMhz+Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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