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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d18e089702de492a3cfdd66d86fa7e754c99141c09d9f2f4c889139912e9ec2' 
  AND token = 'dnRBGDWZH/fTEiegxNrbUSUfOh7R8w8pOmd0f2GoeFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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