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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2186da3ffaaa47a162613c6c3dc10e2235b86b8203839d646fb2fc22d77dec' 
  AND token = 'hqnlmC4nT3L+EP9ajcCm4fobfEEzoRPOqtoRXSsqcLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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