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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e82fcfe0030d2de817c1afb7a8bf7c43bd88b59de14634dd36cad322cb314d' 
  AND token = 'ioIptTconzM9eP+lyM1/nliyePJIf/vLuKMF5QAldRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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