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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b08a479edd364d0d68fb606f0dec9712094eaac53cff2a5395ff485b837471' 
  AND token = '/hMuAG8wXlso2KFYid90Vk1az1xR6XlY4iSONsWh6fs=' 
  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"
    }
  }
}