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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05b5a1882ce68959b3a4efd0b458594b3e0c6489e39da332369768d4b5d02d4' 
  AND token = 'ggSY1dEgJrDerGG3G6If4x6vqH7vLVMTBroEybYuFaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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