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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcb66c3f742f6e3fefe78b1df2033464dac46119f4f2952b2cfd0f802deeb20' 
  AND token = 'oh+uCnduJEhOiMocypz/F4etCC4/5HXFesfMVq2cq94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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