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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7456fec2e51594b7427135ec310230508e57e41e72758e46ae9ecbdae1b4cd06' 
  AND token = 'fL8Ho1i8VdZtw3PR8Xa83IgIYN8IyjL7ffCA7A+hLMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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