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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e2e4de62fd5aed9f53a87952189452f700676d17c65f95ca7f71d49e2e44b9' 
  AND token = 'nTAFZwj7IpdxdAETUeqPPhN1RSfsZXN/rK6yhM0jkbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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