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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351ec6c329fe8b7f2d2c1d13318c430df8992431a972d627c64aa9bd42a1e0f0' 
  AND token = 'v1G5Y7NZFMcrHkFiv6L/TYphDJgzdsEssFpu4LcyfO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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